Double check-valve.



H. H. Pmasco a. E. H. coNsmmE.

DOUBLECHECK VALVE'. AFPLI'CTION FILED OCT. 24, 9|6| 1,240,254. rmmdsept.18,1917.

Wits

Inventors Attorneys HARRY H. PBESCOTT AND EDWARD H.- CONSIDINE, OFCHICAGO, ILLINOIS.

DOUBLE CHECK-VALVE.

Specication of Letters Patent.

Patented Sept., 18, 1917..

Application led October 24, 1916. Serial No. 127,439.

To all lwhom z't may concern.'

Be itknown that we, HARRY H. Pimsoo'i'r and EDWARD H. CoNsiDiNE,citizens of the United States, residing at Chicago, in the county ofCook, State of Illinois, have invented a new a-nd useful Double Check-Valve, of which the following is a specification.

The present invention appertains generally to valves, and aims toprovide an automatic double check valve for a vent pipe or the like, thestructure being attachable to one end of a pipe for admitting air, gasor fluid into the pipe from one poi-t and discharging the air or fluidthrough another port, the end of the pipe being normally closed by thevalves when there is no flow of fluid,

It is the object of the invention to provide a double check valve ofnovel and iniproved construction, which is extremely simple andinexpensive, as well as being thoroughly practical and efficient inilse.

With. the foregoing and other objects in view which will appear as' thedescription proceeds, the invention resides in the combination andarrangement ofiparts andin the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed can be made within thescope of what is claimed, without departing from the spirit of theinvention.

The invention is illustrated in the accompanying drawing, wherein Figure1 is a perspective view of the 5device.

Fig. 2 is a median vertical section thereof.

In carrying out the present invention, there is provided. ahorizontally' elongated relatively flat casing 1 of rectangular outlinein side elevation, with its bottom open. The casingl is provided withinits lower ortion intermediate the ends with a short conduit 2terminating in a depending nipple 3 which is threaded or otherwiseformed for attachment to the upper end of a vent pipe, or the like. Theconduit or portion 2 provides opposite downwardly opening ports 41and 5between the conduit 2 and the ends of the casing, the port 4 being theexhaust or discharge port, and the port 5 being the inlet port.

The casing is provided between its sides with a vertical partition 6extending vfrom the top of the casing to the upper end of theconduit 2between opposite sides thereof, and said partition has an extension 7projecting downwardly within the conduit 2, there being a port oropening 8 between the partition 6 and one side of the conduit 2, andahorizontal partition 9 between the partition 6 and the opposite side ofthe conduit. The partition 9 is provided with an opening 10 and anupstanding annular boss 11 surrounding said opening and providing a seatfor a ball valve 12 which seats by gravity upon the valve seat, and thisprovides a check valve for permitting the tlow of air or iuid from thepipe to the outlet or discharge port 4 but to prevent the low of air orfluid into the pipe from said outlet or port 4. The casing 1 has atransverse bar or partition 13 between its sides abovethat side wall ofthe conduit 2 with which the partition 9 is integral, and said bar 13 isspaced from the partition 9 and top of the casing, to provide openingsabove and below thesame. These openings above and below the bar 13permit of the flow of uid past said bar without interference, and thelower opening permits sediment and other foreign matter to be drained orcleaned from the valve seat. The bar 13 connes the valve 12 for movementabove the valve seat, and revents the valve from rolling oli' of theval)ve seat 11 and partition 9 Vinto .the opening or outlet 4.

A horizontal partition 14, preferably in the same plane as the partition9, connects that side wall ofthe conduit 2 remote from vthe partition 9with the respective ends of the ball valve 17. Said valve 1T is seatableb v gravity, the same as the valve 12, and permits of the flow of airoi' fluid into the casing by way of the inleti, to prevent the dischargeof'fluid through said inlet. The casing haga second transverse bar orpartition 18 disposed in a vertical plane, the same as theliar 13, andconnecting the sides of the casing, said bai'I being spaced from theconduit 2 and top of the casiiig .'to provide openings'. above and belowthe saine for the `flow of fluid, the lower opening below the .bar 18permitting the sediment or other foreign. matter to be drained orcleaned from the valve seat 16.

The parts 2, 3, 6, 7, 9, 13, 14 and 18 can all be cast integral with thecasing l,

thereby to provide a cheap yet eliicient construction.

The top of the casin 1 is provided with openings 19 and 2O a ove therespective valve seats 11 and 16, and said openings are normallyclosedby the removable screw plugs 21 and 22, respectively. When theplugs are removed, this gives access to thefvalves and' their seats,whereby the valves canA be removed and replaced, and the valve seats arecleaned.

Air or other fluid can flow into the pipe to which the nipple 3 isattached, by way pf the inlet 5, opening 15, opening or port 8, conduit2 and nipple 3the valve 12 remaining seated, but when the air or fluidis forced from the pipe, the valve 17 will seat and the valve 12 isunseated to permit the air or uid to be. discharged by way of theopening 10 and outlet 4.-. The structure can be used upon the upper' endof a vent pipe,

- or for various other purposes for which it side of said portion andthe wall of the ing above the inlet port and having an' open-- ing and avalve seat, and valvesl 'seatablef i upon said seats. v v f f 2. A valvestructure embodying a `horizontally elongated valve casing having alower portion intermediate its ends forattachment to the `upper`end of4a pipe and having outlet and inlet ports between said portion and theends of the casing opening downwardly, said casing having a verticalpartition extendin froml its top toa point between opposite sides ofsaid portion and a horizontal partition between the aforesaid partitionand that side of said portion adjacent to the outlet port, the casinghaving another`- horizontal partition between the opposite side of saidportion and the respective end wall ofthe casing` above the inlet port,the horizontal partitlons each having an openin and a valve seat, ballvalves seatable on sai seats, the casing having bars'between its sidesfor retaining the valves above the seats, the top of the casing havingopenings above thevalve seats, and removable .f A

' rti() closures for said openings. l In testimony that we claim theforegoing as our own, we have hereto aiixed our signatures in theresence of two witnesses. IFPARRY H. PRESCOTT'.

EDWARD H. CONSIDINE. Witnesses:

CARRE CoNsmINE, Louisa WoLoo'rr.

